<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.math.util;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.io.Serializable;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.Arrays;<a name="line.20"></a>
<FONT color="green">021</FONT>    <a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.commons.math.MathRuntimeException;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    /**<a name="line.24"></a>
<FONT color="green">025</FONT>     * &lt;p&gt;<a name="line.25"></a>
<FONT color="green">026</FONT>     * A variable length {@link DoubleArray} implementation that automatically <a name="line.26"></a>
<FONT color="green">027</FONT>     * handles expanding and contracting its internal storage array as elements <a name="line.27"></a>
<FONT color="green">028</FONT>     * are added and removed.<a name="line.28"></a>
<FONT color="green">029</FONT>     * &lt;/p&gt;<a name="line.29"></a>
<FONT color="green">030</FONT>     * &lt;p&gt;<a name="line.30"></a>
<FONT color="green">031</FONT>     *  The internal storage array starts with capacity determined by the<a name="line.31"></a>
<FONT color="green">032</FONT>     * &lt;code&gt;initialCapacity&lt;/code&gt; property, which can be set by the constructor.<a name="line.32"></a>
<FONT color="green">033</FONT>     * The default initial capacity is 16.  Adding elements using <a name="line.33"></a>
<FONT color="green">034</FONT>     * {@link #addElement(double)} appends elements to the end of the array.  When <a name="line.34"></a>
<FONT color="green">035</FONT>     * there are no open entries at the end of the internal storage array, the <a name="line.35"></a>
<FONT color="green">036</FONT>     * array is expanded.  The size of the expanded array depends on the <a name="line.36"></a>
<FONT color="green">037</FONT>     * &lt;code&gt;expansionMode&lt;/code&gt; and &lt;code&gt;expansionFactor&lt;/code&gt; properties.  <a name="line.37"></a>
<FONT color="green">038</FONT>     * The &lt;code&gt;expansionMode&lt;/code&gt; determines whether the size of the array is <a name="line.38"></a>
<FONT color="green">039</FONT>     * multiplied by the &lt;code&gt;expansionFactor&lt;/code&gt; (MULTIPLICATIVE_MODE) or if <a name="line.39"></a>
<FONT color="green">040</FONT>     * the expansion is additive (ADDITIVE_MODE -- &lt;code&gt;expansionFactor&lt;/code&gt;<a name="line.40"></a>
<FONT color="green">041</FONT>     * storage locations added).  The default &lt;code&gt;expansionMode&lt;/code&gt; is <a name="line.41"></a>
<FONT color="green">042</FONT>     * MULTIPLICATIVE_MODE and the default &lt;code&gt;expansionFactor&lt;/code&gt;<a name="line.42"></a>
<FONT color="green">043</FONT>     * is 2.0.<a name="line.43"></a>
<FONT color="green">044</FONT>     * &lt;/p&gt;<a name="line.44"></a>
<FONT color="green">045</FONT>     * &lt;p&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>     * The {@link #addElementRolling(double)} method adds a new element to the end<a name="line.46"></a>
<FONT color="green">047</FONT>     * of the internal storage array and adjusts the "usable window" of the <a name="line.47"></a>
<FONT color="green">048</FONT>     * internal array forward by one position (effectively making what was the <a name="line.48"></a>
<FONT color="green">049</FONT>     * second element the first, and so on).  Repeated activations of this method<a name="line.49"></a>
<FONT color="green">050</FONT>     * (or activation of {@link #discardFrontElements(int)}) will effectively orphan<a name="line.50"></a>
<FONT color="green">051</FONT>     * the storage locations at the beginning of the internal storage array.  To<a name="line.51"></a>
<FONT color="green">052</FONT>     * reclaim this storage, each time one of these methods is activated, the size<a name="line.52"></a>
<FONT color="green">053</FONT>     * of the internal storage array is compared to the number of addressable <a name="line.53"></a>
<FONT color="green">054</FONT>     * elements (the &lt;code&gt;numElements&lt;/code&gt; property) and if the difference<a name="line.54"></a>
<FONT color="green">055</FONT>     * is too large, the internal array is contracted to size <a name="line.55"></a>
<FONT color="green">056</FONT>     * &lt;code&gt;numElements + 1.&lt;/code&gt;  The determination of when the internal<a name="line.56"></a>
<FONT color="green">057</FONT>     * storage array is "too large" depends on the &lt;code&gt;expansionMode&lt;/code&gt; and<a name="line.57"></a>
<FONT color="green">058</FONT>     * &lt;code&gt;contractionFactor&lt;/code&gt; properties.  If  the &lt;code&gt;expansionMode&lt;/code&gt;<a name="line.58"></a>
<FONT color="green">059</FONT>     * is &lt;code&gt;MULTIPLICATIVE_MODE&lt;/code&gt;, contraction is triggered when the<a name="line.59"></a>
<FONT color="green">060</FONT>     * ratio between storage array length and &lt;code&gt;numElements&lt;/code&gt; exceeds<a name="line.60"></a>
<FONT color="green">061</FONT>     * &lt;code&gt;contractionFactor.&lt;/code&gt;  If the &lt;code&gt;expansionMode&lt;/code&gt;<a name="line.61"></a>
<FONT color="green">062</FONT>     * is &lt;code&gt;ADDITIVE_MODE,&lt;/code&gt; the number of excess storage locations<a name="line.62"></a>
<FONT color="green">063</FONT>     * is compared to &lt;code&gt;contractionFactor.&lt;/code&gt;  <a name="line.63"></a>
<FONT color="green">064</FONT>     * &lt;/p&gt;<a name="line.64"></a>
<FONT color="green">065</FONT>     * &lt;p&gt;<a name="line.65"></a>
<FONT color="green">066</FONT>     * To avoid cycles of expansions and contractions, the <a name="line.66"></a>
<FONT color="green">067</FONT>     * &lt;code&gt;expansionFactor&lt;/code&gt; must not exceed the <a name="line.67"></a>
<FONT color="green">068</FONT>     * &lt;code&gt;contractionFactor.&lt;/code&gt; Constructors and mutators for both of these<a name="line.68"></a>
<FONT color="green">069</FONT>     * properties enforce this requirement, throwing IllegalArgumentException if it<a name="line.69"></a>
<FONT color="green">070</FONT>     * is violated.<a name="line.70"></a>
<FONT color="green">071</FONT>     * &lt;/p&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>     * @version $Revision: 796021 $ $Date: 2009-07-20 17:27:12 -0400 (Mon, 20 Jul 2009) $<a name="line.72"></a>
<FONT color="green">073</FONT>     */<a name="line.73"></a>
<FONT color="green">074</FONT>    public class ResizableDoubleArray implements DoubleArray, Serializable {<a name="line.74"></a>
<FONT color="green">075</FONT>        <a name="line.75"></a>
<FONT color="green">076</FONT>        /** Serializable version identifier */<a name="line.76"></a>
<FONT color="green">077</FONT>        private static final long serialVersionUID = -3485529955529426875L; <a name="line.77"></a>
<FONT color="green">078</FONT>        <a name="line.78"></a>
<FONT color="green">079</FONT>        /** additive expansion mode */<a name="line.79"></a>
<FONT color="green">080</FONT>        public static final int ADDITIVE_MODE = 1;<a name="line.80"></a>
<FONT color="green">081</FONT>        <a name="line.81"></a>
<FONT color="green">082</FONT>        /** multiplicative expansion mode */<a name="line.82"></a>
<FONT color="green">083</FONT>        public static final int MULTIPLICATIVE_MODE = 0;<a name="line.83"></a>
<FONT color="green">084</FONT>       <a name="line.84"></a>
<FONT color="green">085</FONT>        /** <a name="line.85"></a>
<FONT color="green">086</FONT>         * The contraction criteria determines when the internal array will be <a name="line.86"></a>
<FONT color="green">087</FONT>         * contracted to fit the number of elements contained in the element<a name="line.87"></a>
<FONT color="green">088</FONT>         *  array + 1.<a name="line.88"></a>
<FONT color="green">089</FONT>         */<a name="line.89"></a>
<FONT color="green">090</FONT>        protected float contractionCriteria = 2.5f;<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>        /** <a name="line.92"></a>
<FONT color="green">093</FONT>         * The expansion factor of the array.  When the array needs to be expanded, <a name="line.93"></a>
<FONT color="green">094</FONT>         * the new array size will be <a name="line.94"></a>
<FONT color="green">095</FONT>         * &lt;code&gt;internalArray.length * expansionFactor&lt;/code&gt;<a name="line.95"></a>
<FONT color="green">096</FONT>         * if &lt;code&gt;expansionMode&lt;/code&gt; is set to MULTIPLICATIVE_MODE, or<a name="line.96"></a>
<FONT color="green">097</FONT>         * &lt;code&gt;internalArray.length + expansionFactor&lt;/code&gt; if <a name="line.97"></a>
<FONT color="green">098</FONT>         * &lt;code&gt;expansionMode&lt;/code&gt; is set to ADDITIVE_MODE.<a name="line.98"></a>
<FONT color="green">099</FONT>         */<a name="line.99"></a>
<FONT color="green">100</FONT>        protected float expansionFactor = 2.0f;<a name="line.100"></a>
<FONT color="green">101</FONT>        <a name="line.101"></a>
<FONT color="green">102</FONT>        /**<a name="line.102"></a>
<FONT color="green">103</FONT>         * Determines whether array expansion by &lt;code&gt;expansionFactor&lt;/code&gt;<a name="line.103"></a>
<FONT color="green">104</FONT>         * is additive or multiplicative.<a name="line.104"></a>
<FONT color="green">105</FONT>         */<a name="line.105"></a>
<FONT color="green">106</FONT>        protected int expansionMode = MULTIPLICATIVE_MODE;<a name="line.106"></a>
<FONT color="green">107</FONT>    <a name="line.107"></a>
<FONT color="green">108</FONT>        /**<a name="line.108"></a>
<FONT color="green">109</FONT>         * The initial capacity of the array.  Initial capacity is not exposed as a<a name="line.109"></a>
<FONT color="green">110</FONT>         * property as it is only meaningful when passed to a constructor.<a name="line.110"></a>
<FONT color="green">111</FONT>         */<a name="line.111"></a>
<FONT color="green">112</FONT>        protected int initialCapacity = 16;<a name="line.112"></a>
<FONT color="green">113</FONT>        <a name="line.113"></a>
<FONT color="green">114</FONT>        /** <a name="line.114"></a>
<FONT color="green">115</FONT>         * The internal storage array.<a name="line.115"></a>
<FONT color="green">116</FONT>         */<a name="line.116"></a>
<FONT color="green">117</FONT>        protected double[] internalArray;<a name="line.117"></a>
<FONT color="green">118</FONT>    <a name="line.118"></a>
<FONT color="green">119</FONT>        /** <a name="line.119"></a>
<FONT color="green">120</FONT>         * The number of addressable elements in the array.  Note that this<a name="line.120"></a>
<FONT color="green">121</FONT>         * has nothing to do with the length of the internal storage array.<a name="line.121"></a>
<FONT color="green">122</FONT>         */<a name="line.122"></a>
<FONT color="green">123</FONT>        protected int numElements = 0;<a name="line.123"></a>
<FONT color="green">124</FONT>    <a name="line.124"></a>
<FONT color="green">125</FONT>        /** <a name="line.125"></a>
<FONT color="green">126</FONT>         * The position of the first addressable element in the internal storage<a name="line.126"></a>
<FONT color="green">127</FONT>         * array.  The addressable elements in the array are &lt;code&gt;<a name="line.127"></a>
<FONT color="green">128</FONT>         * internalArray[startIndex],...,internalArray[startIndex + numElements -1]<a name="line.128"></a>
<FONT color="green">129</FONT>         * &lt;/code&gt;<a name="line.129"></a>
<FONT color="green">130</FONT>         */<a name="line.130"></a>
<FONT color="green">131</FONT>        protected int startIndex = 0;<a name="line.131"></a>
<FONT color="green">132</FONT>    <a name="line.132"></a>
<FONT color="green">133</FONT>        /**<a name="line.133"></a>
<FONT color="green">134</FONT>         * Create a ResizableArray with default properties.<a name="line.134"></a>
<FONT color="green">135</FONT>         * &lt;ul&gt;<a name="line.135"></a>
<FONT color="green">136</FONT>         * &lt;li&gt;&lt;code&gt;initialCapacity = 16&lt;/code&gt;&lt;/li&gt;<a name="line.136"></a>
<FONT color="green">137</FONT>         * &lt;li&gt;&lt;code&gt;expansionMode = MULTIPLICATIVE_MODE&lt;/code&gt;&lt;/li&gt;<a name="line.137"></a>
<FONT color="green">138</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor = 2.5&lt;/code&gt;&lt;/li&gt;<a name="line.138"></a>
<FONT color="green">139</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor = 2.0&lt;/code&gt;&lt;/li&gt;<a name="line.139"></a>
<FONT color="green">140</FONT>         * &lt;/ul&gt;<a name="line.140"></a>
<FONT color="green">141</FONT>         */<a name="line.141"></a>
<FONT color="green">142</FONT>        public ResizableDoubleArray() {<a name="line.142"></a>
<FONT color="green">143</FONT>            internalArray = new double[initialCapacity];<a name="line.143"></a>
<FONT color="green">144</FONT>        }<a name="line.144"></a>
<FONT color="green">145</FONT>    <a name="line.145"></a>
<FONT color="green">146</FONT>        /**<a name="line.146"></a>
<FONT color="green">147</FONT>         * Create a ResizableArray with the specified initial capacity.  Other<a name="line.147"></a>
<FONT color="green">148</FONT>         * properties take default values:<a name="line.148"></a>
<FONT color="green">149</FONT>          * &lt;ul&gt;<a name="line.149"></a>
<FONT color="green">150</FONT>         * &lt;li&gt;&lt;code&gt;expansionMode = MULTIPLICATIVE_MODE&lt;/code&gt;&lt;/li&gt;<a name="line.150"></a>
<FONT color="green">151</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor = 2.5&lt;/code&gt;&lt;/li&gt;<a name="line.151"></a>
<FONT color="green">152</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor = 2.0&lt;/code&gt;&lt;/li&gt;<a name="line.152"></a>
<FONT color="green">153</FONT>         * &lt;/ul&gt;<a name="line.153"></a>
<FONT color="green">154</FONT>         * @param initialCapacity The initial size of the internal storage array<a name="line.154"></a>
<FONT color="green">155</FONT>         * @throws IllegalArgumentException if initialCapacity is not &gt; 0<a name="line.155"></a>
<FONT color="green">156</FONT>         */<a name="line.156"></a>
<FONT color="green">157</FONT>        public ResizableDoubleArray(int initialCapacity) {<a name="line.157"></a>
<FONT color="green">158</FONT>            setInitialCapacity(initialCapacity);<a name="line.158"></a>
<FONT color="green">159</FONT>            internalArray = new double[this.initialCapacity];<a name="line.159"></a>
<FONT color="green">160</FONT>        }<a name="line.160"></a>
<FONT color="green">161</FONT>    <a name="line.161"></a>
<FONT color="green">162</FONT>        /**<a name="line.162"></a>
<FONT color="green">163</FONT>         * &lt;p&gt;<a name="line.163"></a>
<FONT color="green">164</FONT>         * Create a ResizableArray with the specified initial capacity <a name="line.164"></a>
<FONT color="green">165</FONT>         * and expansion factor.  The remaining properties take default<a name="line.165"></a>
<FONT color="green">166</FONT>         * values:<a name="line.166"></a>
<FONT color="green">167</FONT>         * &lt;ul&gt;<a name="line.167"></a>
<FONT color="green">168</FONT>         * &lt;li&gt;&lt;code&gt;expansionMode = MULTIPLICATIVE_MODE&lt;/code&gt;&lt;/li&gt;<a name="line.168"></a>
<FONT color="green">169</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor = 0.5 + expansionFactor&lt;/code&gt;&lt;/li&gt;<a name="line.169"></a>
<FONT color="green">170</FONT>         * &lt;/ul&gt;&lt;/p&gt;<a name="line.170"></a>
<FONT color="green">171</FONT>         * &lt;p&gt;<a name="line.171"></a>
<FONT color="green">172</FONT>         * Throws IllegalArgumentException if the following conditions are<a name="line.172"></a>
<FONT color="green">173</FONT>         * not met:<a name="line.173"></a>
<FONT color="green">174</FONT>         * &lt;ul&gt;<a name="line.174"></a>
<FONT color="green">175</FONT>         * &lt;li&gt;&lt;code&gt;initialCapacity &gt; 0&lt;/code&gt;&lt;/li&gt;<a name="line.175"></a>
<FONT color="green">176</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor &gt; 1&lt;/code&gt;&lt;/li&gt;<a name="line.176"></a>
<FONT color="green">177</FONT>         * &lt;/ul&gt;&lt;/p&gt;<a name="line.177"></a>
<FONT color="green">178</FONT>         * <a name="line.178"></a>
<FONT color="green">179</FONT>         * @param initialCapacity The initial size of the internal storage array<a name="line.179"></a>
<FONT color="green">180</FONT>         * @param expansionFactor the array will be expanded based on this <a name="line.180"></a>
<FONT color="green">181</FONT>         *                        parameter<a name="line.181"></a>
<FONT color="green">182</FONT>         * @throws IllegalArgumentException if parameters are not valid<a name="line.182"></a>
<FONT color="green">183</FONT>         */<a name="line.183"></a>
<FONT color="green">184</FONT>        public ResizableDoubleArray(int initialCapacity, float expansionFactor) {<a name="line.184"></a>
<FONT color="green">185</FONT>            this.expansionFactor = expansionFactor;<a name="line.185"></a>
<FONT color="green">186</FONT>            setInitialCapacity(initialCapacity);<a name="line.186"></a>
<FONT color="green">187</FONT>            internalArray = new double[initialCapacity];<a name="line.187"></a>
<FONT color="green">188</FONT>            setContractionCriteria(expansionFactor +0.5f);<a name="line.188"></a>
<FONT color="green">189</FONT>        }<a name="line.189"></a>
<FONT color="green">190</FONT>    <a name="line.190"></a>
<FONT color="green">191</FONT>        /**<a name="line.191"></a>
<FONT color="green">192</FONT>         * &lt;p&gt;<a name="line.192"></a>
<FONT color="green">193</FONT>         * Create a ResizableArray with the specified initialCapacity, <a name="line.193"></a>
<FONT color="green">194</FONT>         * expansionFactor, and contractionCriteria. The &lt;code&gt;expansionMode&lt;/code&gt;<a name="line.194"></a>
<FONT color="green">195</FONT>         * will default to &lt;code&gt;MULTIPLICATIVE_MODE.&lt;/code&gt;&lt;/p&gt;<a name="line.195"></a>
<FONT color="green">196</FONT>         * &lt;p&gt;<a name="line.196"></a>
<FONT color="green">197</FONT>         * Throws IllegalArgumentException if the following conditions are<a name="line.197"></a>
<FONT color="green">198</FONT>         * not met:<a name="line.198"></a>
<FONT color="green">199</FONT>         * &lt;ul&gt;<a name="line.199"></a>
<FONT color="green">200</FONT>         * &lt;li&gt;&lt;code&gt;initialCapacity &gt; 0&lt;/code&gt;&lt;/li&gt;<a name="line.200"></a>
<FONT color="green">201</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor &gt; 1&lt;/code&gt;&lt;/li&gt;<a name="line.201"></a>
<FONT color="green">202</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor &gt;= expansionFactor&lt;/code&gt;&lt;/li&gt;<a name="line.202"></a>
<FONT color="green">203</FONT>         * &lt;/ul&gt;&lt;/p&gt;<a name="line.203"></a>
<FONT color="green">204</FONT>         * @param initialCapacity The initial size of the internal storage array<a name="line.204"></a>
<FONT color="green">205</FONT>         * @param expansionFactor the array will be expanded based on this <a name="line.205"></a>
<FONT color="green">206</FONT>         *                        parameter<a name="line.206"></a>
<FONT color="green">207</FONT>         * @param contractionCriteria The contraction Criteria.<a name="line.207"></a>
<FONT color="green">208</FONT>         * @throws IllegalArgumentException if parameters are not valid<a name="line.208"></a>
<FONT color="green">209</FONT>         */<a name="line.209"></a>
<FONT color="green">210</FONT>        public ResizableDoubleArray(int initialCapacity, float expansionFactor,<a name="line.210"></a>
<FONT color="green">211</FONT>            float contractionCriteria) {<a name="line.211"></a>
<FONT color="green">212</FONT>            this.expansionFactor = expansionFactor;<a name="line.212"></a>
<FONT color="green">213</FONT>            setContractionCriteria(contractionCriteria);<a name="line.213"></a>
<FONT color="green">214</FONT>            setInitialCapacity(initialCapacity);<a name="line.214"></a>
<FONT color="green">215</FONT>            internalArray = new double[initialCapacity];<a name="line.215"></a>
<FONT color="green">216</FONT>        }<a name="line.216"></a>
<FONT color="green">217</FONT>        <a name="line.217"></a>
<FONT color="green">218</FONT>        /**<a name="line.218"></a>
<FONT color="green">219</FONT>         * &lt;p&gt;<a name="line.219"></a>
<FONT color="green">220</FONT>         * Create a ResizableArray with the specified properties.&lt;/p&gt;<a name="line.220"></a>
<FONT color="green">221</FONT>        * &lt;p&gt;<a name="line.221"></a>
<FONT color="green">222</FONT>         * Throws IllegalArgumentException if the following conditions are<a name="line.222"></a>
<FONT color="green">223</FONT>         * not met:<a name="line.223"></a>
<FONT color="green">224</FONT>         * &lt;ul&gt;<a name="line.224"></a>
<FONT color="green">225</FONT>         * &lt;li&gt;&lt;code&gt;initialCapacity &gt; 0&lt;/code&gt;&lt;/li&gt;<a name="line.225"></a>
<FONT color="green">226</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor &gt; 1&lt;/code&gt;&lt;/li&gt;<a name="line.226"></a>
<FONT color="green">227</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor &gt;= expansionFactor&lt;/code&gt;&lt;/li&gt;<a name="line.227"></a>
<FONT color="green">228</FONT>         * &lt;li&gt;&lt;code&gt;expansionMode in {MULTIPLICATIVE_MODE, ADDITIVE_MODE}&lt;/code&gt;<a name="line.228"></a>
<FONT color="green">229</FONT>         * &lt;/li&gt;<a name="line.229"></a>
<FONT color="green">230</FONT>         * &lt;/ul&gt;&lt;/p&gt;<a name="line.230"></a>
<FONT color="green">231</FONT>         * <a name="line.231"></a>
<FONT color="green">232</FONT>         * @param initialCapacity the initial size of the internal storage array<a name="line.232"></a>
<FONT color="green">233</FONT>         * @param expansionFactor the array will be expanded based on this <a name="line.233"></a>
<FONT color="green">234</FONT>         *                        parameter<a name="line.234"></a>
<FONT color="green">235</FONT>         * @param contractionCriteria the contraction Criteria<a name="line.235"></a>
<FONT color="green">236</FONT>         * @param expansionMode  the expansion mode<a name="line.236"></a>
<FONT color="green">237</FONT>         * @throws IllegalArgumentException if parameters are not valid<a name="line.237"></a>
<FONT color="green">238</FONT>         */<a name="line.238"></a>
<FONT color="green">239</FONT>        public ResizableDoubleArray(int initialCapacity, float expansionFactor,<a name="line.239"></a>
<FONT color="green">240</FONT>                float contractionCriteria, int expansionMode) {<a name="line.240"></a>
<FONT color="green">241</FONT>            this.expansionFactor = expansionFactor;<a name="line.241"></a>
<FONT color="green">242</FONT>            setContractionCriteria(contractionCriteria);<a name="line.242"></a>
<FONT color="green">243</FONT>            setInitialCapacity(initialCapacity);<a name="line.243"></a>
<FONT color="green">244</FONT>            setExpansionMode(expansionMode);<a name="line.244"></a>
<FONT color="green">245</FONT>            internalArray = new double[initialCapacity];<a name="line.245"></a>
<FONT color="green">246</FONT>        }<a name="line.246"></a>
<FONT color="green">247</FONT>        <a name="line.247"></a>
<FONT color="green">248</FONT>        /**<a name="line.248"></a>
<FONT color="green">249</FONT>         * Copy constructor.  Creates a new ResizableDoubleArray that is a deep,<a name="line.249"></a>
<FONT color="green">250</FONT>         * fresh copy of the original. Needs to acquire synchronization lock<a name="line.250"></a>
<FONT color="green">251</FONT>         * on original.  Original may not be null; otherwise a NullPointerException<a name="line.251"></a>
<FONT color="green">252</FONT>         * is thrown.<a name="line.252"></a>
<FONT color="green">253</FONT>         * <a name="line.253"></a>
<FONT color="green">254</FONT>         * @param original array to copy<a name="line.254"></a>
<FONT color="green">255</FONT>         * @since 2.0<a name="line.255"></a>
<FONT color="green">256</FONT>         */<a name="line.256"></a>
<FONT color="green">257</FONT>        public ResizableDoubleArray(ResizableDoubleArray original) {<a name="line.257"></a>
<FONT color="green">258</FONT>            copy(original, this);<a name="line.258"></a>
<FONT color="green">259</FONT>        }<a name="line.259"></a>
<FONT color="green">260</FONT>    <a name="line.260"></a>
<FONT color="green">261</FONT>        /**<a name="line.261"></a>
<FONT color="green">262</FONT>         * Adds an element to the end of this expandable array.<a name="line.262"></a>
<FONT color="green">263</FONT>         * <a name="line.263"></a>
<FONT color="green">264</FONT>         * @param value to be added to end of array<a name="line.264"></a>
<FONT color="green">265</FONT>         */<a name="line.265"></a>
<FONT color="green">266</FONT>        public synchronized void addElement(double value) {<a name="line.266"></a>
<FONT color="green">267</FONT>            numElements++;<a name="line.267"></a>
<FONT color="green">268</FONT>            if ((startIndex + numElements) &gt; internalArray.length) {<a name="line.268"></a>
<FONT color="green">269</FONT>                expand();<a name="line.269"></a>
<FONT color="green">270</FONT>            }<a name="line.270"></a>
<FONT color="green">271</FONT>            internalArray[startIndex + (numElements - 1)] = value;<a name="line.271"></a>
<FONT color="green">272</FONT>            if (shouldContract()) {<a name="line.272"></a>
<FONT color="green">273</FONT>                contract();<a name="line.273"></a>
<FONT color="green">274</FONT>            }<a name="line.274"></a>
<FONT color="green">275</FONT>        }<a name="line.275"></a>
<FONT color="green">276</FONT>    <a name="line.276"></a>
<FONT color="green">277</FONT>        /**<a name="line.277"></a>
<FONT color="green">278</FONT>         * &lt;p&gt;<a name="line.278"></a>
<FONT color="green">279</FONT>         * Adds an element to the end of the array and removes the first<a name="line.279"></a>
<FONT color="green">280</FONT>         * element in the array.  Returns the discarded first element.<a name="line.280"></a>
<FONT color="green">281</FONT>         * The effect is similar to a push operation in a FIFO queue.<a name="line.281"></a>
<FONT color="green">282</FONT>         * &lt;/p&gt;<a name="line.282"></a>
<FONT color="green">283</FONT>         * &lt;p&gt;<a name="line.283"></a>
<FONT color="green">284</FONT>         * Example: If the array contains the elements 1, 2, 3, 4 (in that order)<a name="line.284"></a>
<FONT color="green">285</FONT>         * and addElementRolling(5) is invoked, the result is an array containing<a name="line.285"></a>
<FONT color="green">286</FONT>         * the entries 2, 3, 4, 5 and the value returned is 1.<a name="line.286"></a>
<FONT color="green">287</FONT>         * &lt;/p&gt;<a name="line.287"></a>
<FONT color="green">288</FONT>         * <a name="line.288"></a>
<FONT color="green">289</FONT>         * @param value the value to be added to the array<a name="line.289"></a>
<FONT color="green">290</FONT>         * @return the value which has been discarded or "pushed" out of the array<a name="line.290"></a>
<FONT color="green">291</FONT>         *         by this rolling insert<a name="line.291"></a>
<FONT color="green">292</FONT>         */<a name="line.292"></a>
<FONT color="green">293</FONT>        public synchronized double addElementRolling(double value) {<a name="line.293"></a>
<FONT color="green">294</FONT>            double discarded = internalArray[startIndex];<a name="line.294"></a>
<FONT color="green">295</FONT>    <a name="line.295"></a>
<FONT color="green">296</FONT>            if ((startIndex + (numElements + 1)) &gt; internalArray.length) {<a name="line.296"></a>
<FONT color="green">297</FONT>                expand();<a name="line.297"></a>
<FONT color="green">298</FONT>            }<a name="line.298"></a>
<FONT color="green">299</FONT>            // Increment the start index<a name="line.299"></a>
<FONT color="green">300</FONT>            startIndex += 1;<a name="line.300"></a>
<FONT color="green">301</FONT>    <a name="line.301"></a>
<FONT color="green">302</FONT>            // Add the new value<a name="line.302"></a>
<FONT color="green">303</FONT>            internalArray[startIndex + (numElements - 1)] = value;<a name="line.303"></a>
<FONT color="green">304</FONT>    <a name="line.304"></a>
<FONT color="green">305</FONT>            // Check the contraction criteria<a name="line.305"></a>
<FONT color="green">306</FONT>            if (shouldContract()) {<a name="line.306"></a>
<FONT color="green">307</FONT>                contract();<a name="line.307"></a>
<FONT color="green">308</FONT>            }<a name="line.308"></a>
<FONT color="green">309</FONT>            return discarded;<a name="line.309"></a>
<FONT color="green">310</FONT>        }<a name="line.310"></a>
<FONT color="green">311</FONT>           <a name="line.311"></a>
<FONT color="green">312</FONT>        /**<a name="line.312"></a>
<FONT color="green">313</FONT>         * Substitutes &lt;code&gt;value&lt;/code&gt; for the most recently added value.<a name="line.313"></a>
<FONT color="green">314</FONT>         * Returns the value that has been replaced. If the array is empty (i.e. <a name="line.314"></a>
<FONT color="green">315</FONT>         * if {@link #numElements} is zero), a MathRuntimeException is thrown.<a name="line.315"></a>
<FONT color="green">316</FONT>         * <a name="line.316"></a>
<FONT color="green">317</FONT>         * @param value new value to substitute for the most recently added value<a name="line.317"></a>
<FONT color="green">318</FONT>         * @return value that has been replaced in the array<a name="line.318"></a>
<FONT color="green">319</FONT>         * @since 2.0<a name="line.319"></a>
<FONT color="green">320</FONT>         */<a name="line.320"></a>
<FONT color="green">321</FONT>        public synchronized double substituteMostRecentElement(double value) {<a name="line.321"></a>
<FONT color="green">322</FONT>            if (numElements &lt; 1) {<a name="line.322"></a>
<FONT color="green">323</FONT>                throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.323"></a>
<FONT color="green">324</FONT>                        "cannot substitute an element from an empty array");<a name="line.324"></a>
<FONT color="green">325</FONT>            }<a name="line.325"></a>
<FONT color="green">326</FONT>    <a name="line.326"></a>
<FONT color="green">327</FONT>            double discarded = internalArray[startIndex + (numElements - 1)];<a name="line.327"></a>
<FONT color="green">328</FONT>    <a name="line.328"></a>
<FONT color="green">329</FONT>            internalArray[startIndex + (numElements - 1)] = value;<a name="line.329"></a>
<FONT color="green">330</FONT>    <a name="line.330"></a>
<FONT color="green">331</FONT>            return discarded;<a name="line.331"></a>
<FONT color="green">332</FONT>        }<a name="line.332"></a>
<FONT color="green">333</FONT>    <a name="line.333"></a>
<FONT color="green">334</FONT>        <a name="line.334"></a>
<FONT color="green">335</FONT>        /**<a name="line.335"></a>
<FONT color="green">336</FONT>         * Checks the expansion factor and the contraction criteria and throws an <a name="line.336"></a>
<FONT color="green">337</FONT>         * IllegalArgumentException if the contractionCriteria is less than the <a name="line.337"></a>
<FONT color="green">338</FONT>         * expansionCriteria<a name="line.338"></a>
<FONT color="green">339</FONT>         * <a name="line.339"></a>
<FONT color="green">340</FONT>         * @param expansionFactor factor to be checked<a name="line.340"></a>
<FONT color="green">341</FONT>         * @param contractionCriteria criteria to be checked<a name="line.341"></a>
<FONT color="green">342</FONT>         * @throws IllegalArgumentException if the contractionCriteria is less than<a name="line.342"></a>
<FONT color="green">343</FONT>         *         the expansionCriteria.<a name="line.343"></a>
<FONT color="green">344</FONT>         */<a name="line.344"></a>
<FONT color="green">345</FONT>        protected void checkContractExpand(<a name="line.345"></a>
<FONT color="green">346</FONT>            float contractionCriteria,<a name="line.346"></a>
<FONT color="green">347</FONT>            float expansionFactor) {<a name="line.347"></a>
<FONT color="green">348</FONT>    <a name="line.348"></a>
<FONT color="green">349</FONT>            if (contractionCriteria &lt; expansionFactor) {<a name="line.349"></a>
<FONT color="green">350</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.350"></a>
<FONT color="green">351</FONT>                        "contraction criteria ({0}) smaller than the expansion factor ({1}).  This would " +<a name="line.351"></a>
<FONT color="green">352</FONT>                        "lead to a never ending loop of expansion and contraction as a newly expanded " +<a name="line.352"></a>
<FONT color="green">353</FONT>                        "internal storage array would immediately satisfy the criteria for contraction",<a name="line.353"></a>
<FONT color="green">354</FONT>                        contractionCriteria, expansionFactor);<a name="line.354"></a>
<FONT color="green">355</FONT>            }<a name="line.355"></a>
<FONT color="green">356</FONT>    <a name="line.356"></a>
<FONT color="green">357</FONT>            if (contractionCriteria &lt;= 1.0) {<a name="line.357"></a>
<FONT color="green">358</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.358"></a>
<FONT color="green">359</FONT>                        "contraction criteria smaller than one ({0}).  This would lead to a never ending " +<a name="line.359"></a>
<FONT color="green">360</FONT>                        "loop of expansion and contraction as an internal storage array length equal " +<a name="line.360"></a>
<FONT color="green">361</FONT>                        "to the number of elements would satisfy the contraction criteria.",<a name="line.361"></a>
<FONT color="green">362</FONT>                        contractionCriteria);<a name="line.362"></a>
<FONT color="green">363</FONT>            }<a name="line.363"></a>
<FONT color="green">364</FONT>    <a name="line.364"></a>
<FONT color="green">365</FONT>            if (expansionFactor &lt;= 1.0) {<a name="line.365"></a>
<FONT color="green">366</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.366"></a>
<FONT color="green">367</FONT>                        "expansion factor smaller than one ({0})",<a name="line.367"></a>
<FONT color="green">368</FONT>                        expansionFactor);<a name="line.368"></a>
<FONT color="green">369</FONT>            }<a name="line.369"></a>
<FONT color="green">370</FONT>        }<a name="line.370"></a>
<FONT color="green">371</FONT>        <a name="line.371"></a>
<FONT color="green">372</FONT>        /**<a name="line.372"></a>
<FONT color="green">373</FONT>         * Clear the array, reset the size to the initialCapacity and the number <a name="line.373"></a>
<FONT color="green">374</FONT>         * of elements to zero.<a name="line.374"></a>
<FONT color="green">375</FONT>         */<a name="line.375"></a>
<FONT color="green">376</FONT>        public synchronized void clear() {<a name="line.376"></a>
<FONT color="green">377</FONT>            numElements = 0;<a name="line.377"></a>
<FONT color="green">378</FONT>            startIndex = 0;<a name="line.378"></a>
<FONT color="green">379</FONT>            internalArray = new double[initialCapacity];<a name="line.379"></a>
<FONT color="green">380</FONT>        }<a name="line.380"></a>
<FONT color="green">381</FONT>        <a name="line.381"></a>
<FONT color="green">382</FONT>        /**<a name="line.382"></a>
<FONT color="green">383</FONT>         * Contracts the storage array to the (size of the element set) + 1 - to <a name="line.383"></a>
<FONT color="green">384</FONT>         * avoid a zero length array. This function also resets the startIndex to <a name="line.384"></a>
<FONT color="green">385</FONT>         * zero. <a name="line.385"></a>
<FONT color="green">386</FONT>         */<a name="line.386"></a>
<FONT color="green">387</FONT>        public synchronized void contract() {<a name="line.387"></a>
<FONT color="green">388</FONT>            double[] tempArray = new double[numElements + 1];<a name="line.388"></a>
<FONT color="green">389</FONT>    <a name="line.389"></a>
<FONT color="green">390</FONT>            // Copy and swap - copy only the element array from the src array.<a name="line.390"></a>
<FONT color="green">391</FONT>            System.arraycopy(internalArray, startIndex, tempArray, 0, numElements);<a name="line.391"></a>
<FONT color="green">392</FONT>            internalArray = tempArray;<a name="line.392"></a>
<FONT color="green">393</FONT>    <a name="line.393"></a>
<FONT color="green">394</FONT>            // Reset the start index to zero<a name="line.394"></a>
<FONT color="green">395</FONT>            startIndex = 0;<a name="line.395"></a>
<FONT color="green">396</FONT>        }<a name="line.396"></a>
<FONT color="green">397</FONT>    <a name="line.397"></a>
<FONT color="green">398</FONT>        /**<a name="line.398"></a>
<FONT color="green">399</FONT>         * Discards the &lt;code&gt;i&lt;code&gt; initial elements of the array.  For example,<a name="line.399"></a>
<FONT color="green">400</FONT>         * if the array contains the elements 1,2,3,4, invoking <a name="line.400"></a>
<FONT color="green">401</FONT>         * &lt;code&gt;discardFrontElements(2)&lt;/code&gt; will cause the first two elements <a name="line.401"></a>
<FONT color="green">402</FONT>         * to be discarded, leaving 3,4 in the array.  Throws illegalArgumentException<a name="line.402"></a>
<FONT color="green">403</FONT>         * if i exceeds numElements.<a name="line.403"></a>
<FONT color="green">404</FONT>         * <a name="line.404"></a>
<FONT color="green">405</FONT>         * @param i  the number of elements to discard from the front of the array<a name="line.405"></a>
<FONT color="green">406</FONT>         * @throws IllegalArgumentException if i is greater than numElements.<a name="line.406"></a>
<FONT color="green">407</FONT>         * @since 2.0<a name="line.407"></a>
<FONT color="green">408</FONT>         */<a name="line.408"></a>
<FONT color="green">409</FONT>        public synchronized void discardFrontElements(int i) {<a name="line.409"></a>
<FONT color="green">410</FONT>    <a name="line.410"></a>
<FONT color="green">411</FONT>            discardExtremeElements(i,true);<a name="line.411"></a>
<FONT color="green">412</FONT>            <a name="line.412"></a>
<FONT color="green">413</FONT>        }<a name="line.413"></a>
<FONT color="green">414</FONT>    <a name="line.414"></a>
<FONT color="green">415</FONT>        /**<a name="line.415"></a>
<FONT color="green">416</FONT>         * Discards the &lt;code&gt;i&lt;code&gt; last elements of the array.  For example,<a name="line.416"></a>
<FONT color="green">417</FONT>         * if the array contains the elements 1,2,3,4, invoking <a name="line.417"></a>
<FONT color="green">418</FONT>         * &lt;code&gt;discardMostRecentElements(2)&lt;/code&gt; will cause the last two elements <a name="line.418"></a>
<FONT color="green">419</FONT>         * to be discarded, leaving 1,2 in the array.  Throws illegalArgumentException<a name="line.419"></a>
<FONT color="green">420</FONT>         * if i exceeds numElements.<a name="line.420"></a>
<FONT color="green">421</FONT>         * <a name="line.421"></a>
<FONT color="green">422</FONT>         * @param i  the number of elements to discard from the end of the array<a name="line.422"></a>
<FONT color="green">423</FONT>         * @throws IllegalArgumentException if i is greater than numElements.<a name="line.423"></a>
<FONT color="green">424</FONT>         * @since 2.0<a name="line.424"></a>
<FONT color="green">425</FONT>         */<a name="line.425"></a>
<FONT color="green">426</FONT>        public synchronized void discardMostRecentElements(int i) {<a name="line.426"></a>
<FONT color="green">427</FONT>    <a name="line.427"></a>
<FONT color="green">428</FONT>            discardExtremeElements(i,false);<a name="line.428"></a>
<FONT color="green">429</FONT>            <a name="line.429"></a>
<FONT color="green">430</FONT>        }<a name="line.430"></a>
<FONT color="green">431</FONT>        <a name="line.431"></a>
<FONT color="green">432</FONT>        /**<a name="line.432"></a>
<FONT color="green">433</FONT>         * Discards the &lt;code&gt;i&lt;code&gt; first or last elements of the array,<a name="line.433"></a>
<FONT color="green">434</FONT>         * depending on the value of &lt;code&gt;front&lt;/code&gt;.<a name="line.434"></a>
<FONT color="green">435</FONT>         * For example, if the array contains the elements 1,2,3,4, invoking <a name="line.435"></a>
<FONT color="green">436</FONT>         * &lt;code&gt;discardExtremeElements(2,false)&lt;/code&gt; will cause the last two elements <a name="line.436"></a>
<FONT color="green">437</FONT>         * to be discarded, leaving 1,2 in the array.<a name="line.437"></a>
<FONT color="green">438</FONT>         * For example, if the array contains the elements 1,2,3,4, invoking <a name="line.438"></a>
<FONT color="green">439</FONT>         * &lt;code&gt;discardExtremeElements(2,true)&lt;/code&gt; will cause the first two elements <a name="line.439"></a>
<FONT color="green">440</FONT>         * to be discarded, leaving 3,4 in the array.<a name="line.440"></a>
<FONT color="green">441</FONT>         * Throws illegalArgumentException<a name="line.441"></a>
<FONT color="green">442</FONT>         * if i exceeds numElements.<a name="line.442"></a>
<FONT color="green">443</FONT>         * <a name="line.443"></a>
<FONT color="green">444</FONT>         * @param i  the number of elements to discard from the front/end of the array<a name="line.444"></a>
<FONT color="green">445</FONT>         * @param front true if elements are to be discarded from the front<a name="line.445"></a>
<FONT color="green">446</FONT>         * of the array, false if elements are to be discarded from the end<a name="line.446"></a>
<FONT color="green">447</FONT>         * of the array <a name="line.447"></a>
<FONT color="green">448</FONT>         * @throws IllegalArgumentException if i is greater than numElements.<a name="line.448"></a>
<FONT color="green">449</FONT>         * @since 2.0<a name="line.449"></a>
<FONT color="green">450</FONT>         */<a name="line.450"></a>
<FONT color="green">451</FONT>        private synchronized void discardExtremeElements(int i,boolean front) {<a name="line.451"></a>
<FONT color="green">452</FONT>            if (i &gt; numElements) {<a name="line.452"></a>
<FONT color="green">453</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.453"></a>
<FONT color="green">454</FONT>                        "cannot discard {0} elements from a {1} elements array",<a name="line.454"></a>
<FONT color="green">455</FONT>                        i, numElements);<a name="line.455"></a>
<FONT color="green">456</FONT>           } else if (i &lt; 0) {<a name="line.456"></a>
<FONT color="green">457</FONT>               throw MathRuntimeException.createIllegalArgumentException(<a name="line.457"></a>
<FONT color="green">458</FONT>                       "cannot discard a negative number of elements ({0})",<a name="line.458"></a>
<FONT color="green">459</FONT>                       i);<a name="line.459"></a>
<FONT color="green">460</FONT>            } else {<a name="line.460"></a>
<FONT color="green">461</FONT>                // "Subtract" this number of discarded from numElements <a name="line.461"></a>
<FONT color="green">462</FONT>                numElements -= i;<a name="line.462"></a>
<FONT color="green">463</FONT>                if (front) startIndex += i;<a name="line.463"></a>
<FONT color="green">464</FONT>            }<a name="line.464"></a>
<FONT color="green">465</FONT>            if (shouldContract()) {<a name="line.465"></a>
<FONT color="green">466</FONT>                contract();<a name="line.466"></a>
<FONT color="green">467</FONT>            }<a name="line.467"></a>
<FONT color="green">468</FONT>        }<a name="line.468"></a>
<FONT color="green">469</FONT>    <a name="line.469"></a>
<FONT color="green">470</FONT>        /**<a name="line.470"></a>
<FONT color="green">471</FONT>         * Expands the internal storage array using the expansion factor.<a name="line.471"></a>
<FONT color="green">472</FONT>         * &lt;p&gt;<a name="line.472"></a>
<FONT color="green">473</FONT>         * if &lt;code&gt;expansionMode&lt;/code&gt; is set to MULTIPLICATIVE_MODE,<a name="line.473"></a>
<FONT color="green">474</FONT>         * the new array size will be &lt;code&gt;internalArray.length * expansionFactor.&lt;/code&gt;<a name="line.474"></a>
<FONT color="green">475</FONT>         * If &lt;code&gt;expansionMode&lt;/code&gt; is set to ADDITIVE_MODE,  the length<a name="line.475"></a>
<FONT color="green">476</FONT>         * after expansion will be &lt;code&gt;internalArray.length + expansionFactor&lt;/code&gt;<a name="line.476"></a>
<FONT color="green">477</FONT>         * &lt;/p&gt;<a name="line.477"></a>
<FONT color="green">478</FONT>         */<a name="line.478"></a>
<FONT color="green">479</FONT>        protected synchronized void expand() {<a name="line.479"></a>
<FONT color="green">480</FONT>    <a name="line.480"></a>
<FONT color="green">481</FONT>            // notice the use of Math.ceil(), this guarantees that we will always <a name="line.481"></a>
<FONT color="green">482</FONT>            // have an array of at least currentSize + 1.   Assume that the <a name="line.482"></a>
<FONT color="green">483</FONT>            // current initial capacity is 1 and the expansion factor<a name="line.483"></a>
<FONT color="green">484</FONT>            // is 1.000000000000000001.  The newly calculated size will be <a name="line.484"></a>
<FONT color="green">485</FONT>            // rounded up to 2 after the multiplication is performed.<a name="line.485"></a>
<FONT color="green">486</FONT>            int newSize = 0;<a name="line.486"></a>
<FONT color="green">487</FONT>            if (expansionMode == MULTIPLICATIVE_MODE) {<a name="line.487"></a>
<FONT color="green">488</FONT>                newSize = (int) Math.ceil(internalArray.length * expansionFactor);<a name="line.488"></a>
<FONT color="green">489</FONT>            } else {<a name="line.489"></a>
<FONT color="green">490</FONT>                newSize = internalArray.length + Math.round(expansionFactor);<a name="line.490"></a>
<FONT color="green">491</FONT>            }<a name="line.491"></a>
<FONT color="green">492</FONT>            double[] tempArray = new double[newSize];<a name="line.492"></a>
<FONT color="green">493</FONT>    <a name="line.493"></a>
<FONT color="green">494</FONT>            // Copy and swap<a name="line.494"></a>
<FONT color="green">495</FONT>            System.arraycopy(internalArray, 0, tempArray, 0, internalArray.length);<a name="line.495"></a>
<FONT color="green">496</FONT>            internalArray = tempArray;<a name="line.496"></a>
<FONT color="green">497</FONT>        }<a name="line.497"></a>
<FONT color="green">498</FONT>        <a name="line.498"></a>
<FONT color="green">499</FONT>        /**<a name="line.499"></a>
<FONT color="green">500</FONT>         * Expands the internal storage array to the specified size.<a name="line.500"></a>
<FONT color="green">501</FONT>         * <a name="line.501"></a>
<FONT color="green">502</FONT>         * @param size Size of the new internal storage array<a name="line.502"></a>
<FONT color="green">503</FONT>         */<a name="line.503"></a>
<FONT color="green">504</FONT>        private synchronized void expandTo(int size) {<a name="line.504"></a>
<FONT color="green">505</FONT>            double[] tempArray = new double[size];<a name="line.505"></a>
<FONT color="green">506</FONT>            // Copy and swap<a name="line.506"></a>
<FONT color="green">507</FONT>            System.arraycopy(internalArray, 0, tempArray, 0, internalArray.length);<a name="line.507"></a>
<FONT color="green">508</FONT>            internalArray = tempArray;<a name="line.508"></a>
<FONT color="green">509</FONT>        }<a name="line.509"></a>
<FONT color="green">510</FONT>    <a name="line.510"></a>
<FONT color="green">511</FONT>        /**<a name="line.511"></a>
<FONT color="green">512</FONT>         * The contraction criteria defines when the internal array will contract <a name="line.512"></a>
<FONT color="green">513</FONT>         * to store only the number of elements in the element array.   <a name="line.513"></a>
<FONT color="green">514</FONT>         * If  the &lt;code&gt;expansionMode&lt;/code&gt; is &lt;code&gt;MULTIPLICATIVE_MODE&lt;/code&gt;,<a name="line.514"></a>
<FONT color="green">515</FONT>         * contraction is triggered when the ratio between storage array length <a name="line.515"></a>
<FONT color="green">516</FONT>         * and &lt;code&gt;numElements&lt;/code&gt; exceeds &lt;code&gt;contractionFactor&lt;/code&gt;.<a name="line.516"></a>
<FONT color="green">517</FONT>         * If the &lt;code&gt;expansionMode&lt;/code&gt; is &lt;code&gt;ADDITIVE_MODE&lt;/code&gt;, the<a name="line.517"></a>
<FONT color="green">518</FONT>         * number of excess storage locations is compared to <a name="line.518"></a>
<FONT color="green">519</FONT>         * &lt;code&gt;contractionFactor.&lt;/code&gt;   <a name="line.519"></a>
<FONT color="green">520</FONT>         * <a name="line.520"></a>
<FONT color="green">521</FONT>         * @return the contraction criteria used to reclaim memory.<a name="line.521"></a>
<FONT color="green">522</FONT>         */<a name="line.522"></a>
<FONT color="green">523</FONT>        public float getContractionCriteria() {<a name="line.523"></a>
<FONT color="green">524</FONT>            return contractionCriteria;<a name="line.524"></a>
<FONT color="green">525</FONT>        }<a name="line.525"></a>
<FONT color="green">526</FONT>        <a name="line.526"></a>
<FONT color="green">527</FONT>        /**<a name="line.527"></a>
<FONT color="green">528</FONT>         * Returns the element at the specified index<a name="line.528"></a>
<FONT color="green">529</FONT>         * <a name="line.529"></a>
<FONT color="green">530</FONT>         * @param index index to fetch a value from<a name="line.530"></a>
<FONT color="green">531</FONT>         * @return value stored at the specified index<a name="line.531"></a>
<FONT color="green">532</FONT>         * @throws ArrayIndexOutOfBoundsException if &lt;code&gt;index&lt;/code&gt; is less than<a name="line.532"></a>
<FONT color="green">533</FONT>         *         zero or is greater than &lt;code&gt;getNumElements() - 1&lt;/code&gt;.<a name="line.533"></a>
<FONT color="green">534</FONT>         */<a name="line.534"></a>
<FONT color="green">535</FONT>        public synchronized double getElement(int index) {<a name="line.535"></a>
<FONT color="green">536</FONT>            if (index &gt;= numElements) {<a name="line.536"></a>
<FONT color="green">537</FONT>                throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.537"></a>
<FONT color="green">538</FONT>                        "the index specified: {0} is larger than the current maximal index {1}",<a name="line.538"></a>
<FONT color="green">539</FONT>                        index, numElements - 1);<a name="line.539"></a>
<FONT color="green">540</FONT>            } else if (index &gt;= 0) {<a name="line.540"></a>
<FONT color="green">541</FONT>                return internalArray[startIndex + index];<a name="line.541"></a>
<FONT color="green">542</FONT>            } else {<a name="line.542"></a>
<FONT color="green">543</FONT>                throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.543"></a>
<FONT color="green">544</FONT>                        "elements cannot be retrieved from a negative array index {0}",<a name="line.544"></a>
<FONT color="green">545</FONT>                        index);<a name="line.545"></a>
<FONT color="green">546</FONT>            }<a name="line.546"></a>
<FONT color="green">547</FONT>        }<a name="line.547"></a>
<FONT color="green">548</FONT>        <a name="line.548"></a>
<FONT color="green">549</FONT>         /**<a name="line.549"></a>
<FONT color="green">550</FONT>         * Returns a double array containing the elements of this <a name="line.550"></a>
<FONT color="green">551</FONT>         * &lt;code&gt;ResizableArray&lt;/code&gt;.  This method returns a copy, not a<a name="line.551"></a>
<FONT color="green">552</FONT>         * reference to the underlying array, so that changes made to the returned<a name="line.552"></a>
<FONT color="green">553</FONT>         *  array have no effect on this &lt;code&gt;ResizableArray.&lt;/code&gt;<a name="line.553"></a>
<FONT color="green">554</FONT>         * @return the double array.<a name="line.554"></a>
<FONT color="green">555</FONT>         */<a name="line.555"></a>
<FONT color="green">556</FONT>        public synchronized double[] getElements() {<a name="line.556"></a>
<FONT color="green">557</FONT>            double[] elementArray = new double[numElements];<a name="line.557"></a>
<FONT color="green">558</FONT>            System.arraycopy( internalArray, startIndex, elementArray, 0,<a name="line.558"></a>
<FONT color="green">559</FONT>                    numElements);<a name="line.559"></a>
<FONT color="green">560</FONT>            return elementArray;<a name="line.560"></a>
<FONT color="green">561</FONT>        }<a name="line.561"></a>
<FONT color="green">562</FONT>        <a name="line.562"></a>
<FONT color="green">563</FONT>        /**<a name="line.563"></a>
<FONT color="green">564</FONT>         * The expansion factor controls the size of a new array when an array <a name="line.564"></a>
<FONT color="green">565</FONT>         * needs to be expanded.  The &lt;code&gt;expansionMode&lt;/code&gt;<a name="line.565"></a>
<FONT color="green">566</FONT>         * determines whether the size of the array is multiplied by the <a name="line.566"></a>
<FONT color="green">567</FONT>         * &lt;code&gt;expansionFactor&lt;/code&gt; (MULTIPLICATIVE_MODE) or if <a name="line.567"></a>
<FONT color="green">568</FONT>         * the expansion is additive (ADDITIVE_MODE -- &lt;code&gt;expansionFactor&lt;/code&gt;<a name="line.568"></a>
<FONT color="green">569</FONT>         * storage locations added).  The default &lt;code&gt;expansionMode&lt;/code&gt; is <a name="line.569"></a>
<FONT color="green">570</FONT>         * MULTIPLICATIVE_MODE and the default &lt;code&gt;expansionFactor&lt;/code&gt;<a name="line.570"></a>
<FONT color="green">571</FONT>         * is 2.0.<a name="line.571"></a>
<FONT color="green">572</FONT>         * <a name="line.572"></a>
<FONT color="green">573</FONT>         * @return the expansion factor of this expandable double array<a name="line.573"></a>
<FONT color="green">574</FONT>         */<a name="line.574"></a>
<FONT color="green">575</FONT>        public float getExpansionFactor() {<a name="line.575"></a>
<FONT color="green">576</FONT>            return expansionFactor;<a name="line.576"></a>
<FONT color="green">577</FONT>        }<a name="line.577"></a>
<FONT color="green">578</FONT>        <a name="line.578"></a>
<FONT color="green">579</FONT>        /**<a name="line.579"></a>
<FONT color="green">580</FONT>         * The &lt;code&gt;expansionMode&lt;/code&gt; determines whether the internal storage <a name="line.580"></a>
<FONT color="green">581</FONT>         * array grows additively (ADDITIVE_MODE) or multiplicatively <a name="line.581"></a>
<FONT color="green">582</FONT>         * (MULTIPLICATIVE_MODE) when it is expanded.<a name="line.582"></a>
<FONT color="green">583</FONT>         * <a name="line.583"></a>
<FONT color="green">584</FONT>         * @return Returns the expansionMode.<a name="line.584"></a>
<FONT color="green">585</FONT>         */<a name="line.585"></a>
<FONT color="green">586</FONT>        public int getExpansionMode() {<a name="line.586"></a>
<FONT color="green">587</FONT>            return expansionMode;<a name="line.587"></a>
<FONT color="green">588</FONT>        }<a name="line.588"></a>
<FONT color="green">589</FONT>        <a name="line.589"></a>
<FONT color="green">590</FONT>        /**<a name="line.590"></a>
<FONT color="green">591</FONT>         * Notice the package scope on this method.   This method is simply here <a name="line.591"></a>
<FONT color="green">592</FONT>         * for the JUnit test, it allows us check if the expansion is working <a name="line.592"></a>
<FONT color="green">593</FONT>         * properly after a number of expansions.  This is not meant to be a part <a name="line.593"></a>
<FONT color="green">594</FONT>         * of the public interface of this class.<a name="line.594"></a>
<FONT color="green">595</FONT>         * <a name="line.595"></a>
<FONT color="green">596</FONT>         * @return the length of the internal storage array.<a name="line.596"></a>
<FONT color="green">597</FONT>         */<a name="line.597"></a>
<FONT color="green">598</FONT>        synchronized int getInternalLength() {<a name="line.598"></a>
<FONT color="green">599</FONT>            return (internalArray.length);<a name="line.599"></a>
<FONT color="green">600</FONT>        }<a name="line.600"></a>
<FONT color="green">601</FONT>    <a name="line.601"></a>
<FONT color="green">602</FONT>        /**<a name="line.602"></a>
<FONT color="green">603</FONT>         * Returns the number of elements currently in the array.  Please note<a name="line.603"></a>
<FONT color="green">604</FONT>         * that this is different from the length of the internal storage array.  <a name="line.604"></a>
<FONT color="green">605</FONT>         *<a name="line.605"></a>
<FONT color="green">606</FONT>         * @return number of elements<a name="line.606"></a>
<FONT color="green">607</FONT>         */<a name="line.607"></a>
<FONT color="green">608</FONT>        public synchronized int getNumElements() {<a name="line.608"></a>
<FONT color="green">609</FONT>            return (numElements);<a name="line.609"></a>
<FONT color="green">610</FONT>        }<a name="line.610"></a>
<FONT color="green">611</FONT>        <a name="line.611"></a>
<FONT color="green">612</FONT>        /**<a name="line.612"></a>
<FONT color="green">613</FONT>         * Returns the internal storage array.  Note that this method returns<a name="line.613"></a>
<FONT color="green">614</FONT>         * a reference to the internal storage array, not a copy, and to correctly<a name="line.614"></a>
<FONT color="green">615</FONT>         * address elements of the array, the &lt;code&gt;startIndex&lt;/code&gt; is<a name="line.615"></a>
<FONT color="green">616</FONT>         * required (available via the {@link #start} method).  This method should<a name="line.616"></a>
<FONT color="green">617</FONT>         * only be used in cases where copying the internal array is not practical.<a name="line.617"></a>
<FONT color="green">618</FONT>         * The {@link #getElements} method should be used in all other cases.<a name="line.618"></a>
<FONT color="green">619</FONT>         *<a name="line.619"></a>
<FONT color="green">620</FONT>         * <a name="line.620"></a>
<FONT color="green">621</FONT>         * @return the internal storage array used by this object<a name="line.621"></a>
<FONT color="green">622</FONT>         * @deprecated replaced by {@link #getInternalValues()} as of 2.0<a name="line.622"></a>
<FONT color="green">623</FONT>         */<a name="line.623"></a>
<FONT color="green">624</FONT>        @Deprecated<a name="line.624"></a>
<FONT color="green">625</FONT>        public synchronized double[] getValues() {<a name="line.625"></a>
<FONT color="green">626</FONT>            return (internalArray);<a name="line.626"></a>
<FONT color="green">627</FONT>        }<a name="line.627"></a>
<FONT color="green">628</FONT>    <a name="line.628"></a>
<FONT color="green">629</FONT>        /**<a name="line.629"></a>
<FONT color="green">630</FONT>         * Returns the internal storage array.  Note that this method returns<a name="line.630"></a>
<FONT color="green">631</FONT>         * a reference to the internal storage array, not a copy, and to correctly<a name="line.631"></a>
<FONT color="green">632</FONT>         * address elements of the array, the &lt;code&gt;startIndex&lt;/code&gt; is<a name="line.632"></a>
<FONT color="green">633</FONT>         * required (available via the {@link #start} method).  This method should<a name="line.633"></a>
<FONT color="green">634</FONT>         * only be used in cases where copying the internal array is not practical.<a name="line.634"></a>
<FONT color="green">635</FONT>         * The {@link #getElements} method should be used in all other cases.<a name="line.635"></a>
<FONT color="green">636</FONT>         *<a name="line.636"></a>
<FONT color="green">637</FONT>         * <a name="line.637"></a>
<FONT color="green">638</FONT>         * @return the internal storage array used by this object<a name="line.638"></a>
<FONT color="green">639</FONT>         * @since 2.0<a name="line.639"></a>
<FONT color="green">640</FONT>         */<a name="line.640"></a>
<FONT color="green">641</FONT>        public synchronized double[] getInternalValues() {<a name="line.641"></a>
<FONT color="green">642</FONT>            return (internalArray);<a name="line.642"></a>
<FONT color="green">643</FONT>        }<a name="line.643"></a>
<FONT color="green">644</FONT>    <a name="line.644"></a>
<FONT color="green">645</FONT>        /**<a name="line.645"></a>
<FONT color="green">646</FONT>         * Sets the contraction criteria for this ExpandContractDoubleArray. <a name="line.646"></a>
<FONT color="green">647</FONT>         * <a name="line.647"></a>
<FONT color="green">648</FONT>         * @param contractionCriteria contraction criteria<a name="line.648"></a>
<FONT color="green">649</FONT>         */<a name="line.649"></a>
<FONT color="green">650</FONT>        public void setContractionCriteria(float contractionCriteria) {<a name="line.650"></a>
<FONT color="green">651</FONT>            checkContractExpand(contractionCriteria, getExpansionFactor());<a name="line.651"></a>
<FONT color="green">652</FONT>            synchronized(this) {<a name="line.652"></a>
<FONT color="green">653</FONT>                this.contractionCriteria = contractionCriteria;<a name="line.653"></a>
<FONT color="green">654</FONT>            }<a name="line.654"></a>
<FONT color="green">655</FONT>        }<a name="line.655"></a>
<FONT color="green">656</FONT>        <a name="line.656"></a>
<FONT color="green">657</FONT>    <a name="line.657"></a>
<FONT color="green">658</FONT>        /**<a name="line.658"></a>
<FONT color="green">659</FONT>         * Sets the element at the specified index.  If the specified index is greater than<a name="line.659"></a>
<FONT color="green">660</FONT>         * &lt;code&gt;getNumElements() - 1&lt;/code&gt;, the &lt;code&gt;numElements&lt;/code&gt; property<a name="line.660"></a>
<FONT color="green">661</FONT>         * is increased to &lt;code&gt;index +1&lt;/code&gt; and additional storage is allocated <a name="line.661"></a>
<FONT color="green">662</FONT>         * (if necessary) for the new element and all  (uninitialized) elements <a name="line.662"></a>
<FONT color="green">663</FONT>         * between the new element and the previous end of the array).<a name="line.663"></a>
<FONT color="green">664</FONT>         * <a name="line.664"></a>
<FONT color="green">665</FONT>         * @param index index to store a value in<a name="line.665"></a>
<FONT color="green">666</FONT>         * @param value value to store at the specified index<a name="line.666"></a>
<FONT color="green">667</FONT>         * @throws ArrayIndexOutOfBoundsException if &lt;code&gt;index&lt;/code&gt; is less than<a name="line.667"></a>
<FONT color="green">668</FONT>         *         zero.<a name="line.668"></a>
<FONT color="green">669</FONT>         */<a name="line.669"></a>
<FONT color="green">670</FONT>        public synchronized void setElement(int index, double value) {<a name="line.670"></a>
<FONT color="green">671</FONT>            if (index &lt; 0) {<a name="line.671"></a>
<FONT color="green">672</FONT>                throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.672"></a>
<FONT color="green">673</FONT>                        "cannot set an element at a negative index {0}",<a name="line.673"></a>
<FONT color="green">674</FONT>                        index);<a name="line.674"></a>
<FONT color="green">675</FONT>            }<a name="line.675"></a>
<FONT color="green">676</FONT>            if (index + 1 &gt; numElements) {<a name="line.676"></a>
<FONT color="green">677</FONT>                numElements = index + 1;<a name="line.677"></a>
<FONT color="green">678</FONT>            }       <a name="line.678"></a>
<FONT color="green">679</FONT>            if ((startIndex + index) &gt;= internalArray.length) {<a name="line.679"></a>
<FONT color="green">680</FONT>                expandTo(startIndex + (index + 1));<a name="line.680"></a>
<FONT color="green">681</FONT>            }    <a name="line.681"></a>
<FONT color="green">682</FONT>            internalArray[startIndex + index] = value;<a name="line.682"></a>
<FONT color="green">683</FONT>        }<a name="line.683"></a>
<FONT color="green">684</FONT>    <a name="line.684"></a>
<FONT color="green">685</FONT>        /**<a name="line.685"></a>
<FONT color="green">686</FONT>         * Sets the expansionFactor.  Throws IllegalArgumentException if the <a name="line.686"></a>
<FONT color="green">687</FONT>         * the following conditions are not met:<a name="line.687"></a>
<FONT color="green">688</FONT>         * &lt;ul&gt;<a name="line.688"></a>
<FONT color="green">689</FONT>         * &lt;li&gt;&lt;code&gt;expansionFactor &gt; 1&lt;/code&gt;&lt;/li&gt;<a name="line.689"></a>
<FONT color="green">690</FONT>         * &lt;li&gt;&lt;code&gt;contractionFactor &gt;= expansionFactor&lt;/code&gt;&lt;/li&gt;<a name="line.690"></a>
<FONT color="green">691</FONT>         * &lt;/ul&gt;<a name="line.691"></a>
<FONT color="green">692</FONT>         * @param expansionFactor the new expansion factor value.<a name="line.692"></a>
<FONT color="green">693</FONT>         * @throws IllegalArgumentException if expansionFactor is &lt;= 1 or greater<a name="line.693"></a>
<FONT color="green">694</FONT>         * than contractionFactor<a name="line.694"></a>
<FONT color="green">695</FONT>         */<a name="line.695"></a>
<FONT color="green">696</FONT>        public void setExpansionFactor(float expansionFactor) {<a name="line.696"></a>
<FONT color="green">697</FONT>            checkContractExpand(getContractionCriteria(), expansionFactor);<a name="line.697"></a>
<FONT color="green">698</FONT>            // The check above verifies that the expansion factor is &gt; 1.0;<a name="line.698"></a>
<FONT color="green">699</FONT>            synchronized(this) {<a name="line.699"></a>
<FONT color="green">700</FONT>                this.expansionFactor = expansionFactor;<a name="line.700"></a>
<FONT color="green">701</FONT>            }<a name="line.701"></a>
<FONT color="green">702</FONT>        }<a name="line.702"></a>
<FONT color="green">703</FONT>    <a name="line.703"></a>
<FONT color="green">704</FONT>        /**<a name="line.704"></a>
<FONT color="green">705</FONT>         * Sets the &lt;code&gt;expansionMode&lt;/code&gt;. The specified value must be one of<a name="line.705"></a>
<FONT color="green">706</FONT>         * ADDITIVE_MODE, MULTIPLICATIVE_MODE.<a name="line.706"></a>
<FONT color="green">707</FONT>         * <a name="line.707"></a>
<FONT color="green">708</FONT>         * @param expansionMode The expansionMode to set.<a name="line.708"></a>
<FONT color="green">709</FONT>         * @throws IllegalArgumentException if the specified mode value is not valid<a name="line.709"></a>
<FONT color="green">710</FONT>         */<a name="line.710"></a>
<FONT color="green">711</FONT>        public void setExpansionMode(int expansionMode) {<a name="line.711"></a>
<FONT color="green">712</FONT>            if (expansionMode != MULTIPLICATIVE_MODE &amp;&amp; <a name="line.712"></a>
<FONT color="green">713</FONT>                    expansionMode != ADDITIVE_MODE) {<a name="line.713"></a>
<FONT color="green">714</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.714"></a>
<FONT color="green">715</FONT>                        "unsupported expansion mode {0}, supported modes are {1} ({2}) and {3} ({4})",<a name="line.715"></a>
<FONT color="green">716</FONT>                        expansionMode, MULTIPLICATIVE_MODE, "MULTIPLICATIVE_MODE",<a name="line.716"></a>
<FONT color="green">717</FONT>                        ADDITIVE_MODE, "ADDITIVE_MODE");<a name="line.717"></a>
<FONT color="green">718</FONT>            }<a name="line.718"></a>
<FONT color="green">719</FONT>            synchronized(this) {<a name="line.719"></a>
<FONT color="green">720</FONT>                this.expansionMode = expansionMode;<a name="line.720"></a>
<FONT color="green">721</FONT>            }<a name="line.721"></a>
<FONT color="green">722</FONT>        }<a name="line.722"></a>
<FONT color="green">723</FONT>        <a name="line.723"></a>
<FONT color="green">724</FONT>        /**<a name="line.724"></a>
<FONT color="green">725</FONT>         * Sets the initial capacity.  Should only be invoked by constructors.<a name="line.725"></a>
<FONT color="green">726</FONT>         * <a name="line.726"></a>
<FONT color="green">727</FONT>         * @param initialCapacity of the array<a name="line.727"></a>
<FONT color="green">728</FONT>         * @throws IllegalArgumentException if &lt;code&gt;initialCapacity&lt;/code&gt; is not<a name="line.728"></a>
<FONT color="green">729</FONT>         *         positive.<a name="line.729"></a>
<FONT color="green">730</FONT>         */<a name="line.730"></a>
<FONT color="green">731</FONT>        protected void setInitialCapacity(int initialCapacity) {<a name="line.731"></a>
<FONT color="green">732</FONT>            if (initialCapacity &gt; 0) {<a name="line.732"></a>
<FONT color="green">733</FONT>                synchronized(this) {<a name="line.733"></a>
<FONT color="green">734</FONT>                    this.initialCapacity = initialCapacity;<a name="line.734"></a>
<FONT color="green">735</FONT>                }<a name="line.735"></a>
<FONT color="green">736</FONT>            } else {<a name="line.736"></a>
<FONT color="green">737</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.737"></a>
<FONT color="green">738</FONT>                        "initial capacity ({0}) is not positive",<a name="line.738"></a>
<FONT color="green">739</FONT>                        initialCapacity);<a name="line.739"></a>
<FONT color="green">740</FONT>            }<a name="line.740"></a>
<FONT color="green">741</FONT>        }<a name="line.741"></a>
<FONT color="green">742</FONT>        <a name="line.742"></a>
<FONT color="green">743</FONT>        /**<a name="line.743"></a>
<FONT color="green">744</FONT>         * This function allows you to control the number of elements contained <a name="line.744"></a>
<FONT color="green">745</FONT>         * in this array, and can be used to "throw out" the last n values in an <a name="line.745"></a>
<FONT color="green">746</FONT>         * array. This function will also expand the internal array as needed.<a name="line.746"></a>
<FONT color="green">747</FONT>         * <a name="line.747"></a>
<FONT color="green">748</FONT>         * @param i a new number of elements<a name="line.748"></a>
<FONT color="green">749</FONT>         * @throws IllegalArgumentException if &lt;code&gt;i&lt;/code&gt; is negative.<a name="line.749"></a>
<FONT color="green">750</FONT>         */<a name="line.750"></a>
<FONT color="green">751</FONT>        public synchronized void setNumElements(int i) {<a name="line.751"></a>
<FONT color="green">752</FONT>    <a name="line.752"></a>
<FONT color="green">753</FONT>            // If index is negative thrown an error<a name="line.753"></a>
<FONT color="green">754</FONT>            if (i &lt; 0) {<a name="line.754"></a>
<FONT color="green">755</FONT>                throw MathRuntimeException.createIllegalArgumentException(<a name="line.755"></a>
<FONT color="green">756</FONT>                        "index ({0}) is not positive",<a name="line.756"></a>
<FONT color="green">757</FONT>                        i);<a name="line.757"></a>
<FONT color="green">758</FONT>            }<a name="line.758"></a>
<FONT color="green">759</FONT>    <a name="line.759"></a>
<FONT color="green">760</FONT>            // Test the new num elements, check to see if the array needs to be <a name="line.760"></a>
<FONT color="green">761</FONT>            // expanded to accommodate this new number of elements<a name="line.761"></a>
<FONT color="green">762</FONT>            if ((startIndex + i) &gt; internalArray.length) {<a name="line.762"></a>
<FONT color="green">763</FONT>                expandTo(startIndex + i);<a name="line.763"></a>
<FONT color="green">764</FONT>            }<a name="line.764"></a>
<FONT color="green">765</FONT>    <a name="line.765"></a>
<FONT color="green">766</FONT>            // Set the new number of elements to new value<a name="line.766"></a>
<FONT color="green">767</FONT>            numElements = i;<a name="line.767"></a>
<FONT color="green">768</FONT>        }<a name="line.768"></a>
<FONT color="green">769</FONT>    <a name="line.769"></a>
<FONT color="green">770</FONT>        /**<a name="line.770"></a>
<FONT color="green">771</FONT>         * Returns true if the internal storage array has too many unused <a name="line.771"></a>
<FONT color="green">772</FONT>         * storage positions.  <a name="line.772"></a>
<FONT color="green">773</FONT>         * <a name="line.773"></a>
<FONT color="green">774</FONT>         * @return true if array satisfies the contraction criteria<a name="line.774"></a>
<FONT color="green">775</FONT>         */<a name="line.775"></a>
<FONT color="green">776</FONT>        private synchronized boolean shouldContract() {<a name="line.776"></a>
<FONT color="green">777</FONT>            if (expansionMode == MULTIPLICATIVE_MODE) { <a name="line.777"></a>
<FONT color="green">778</FONT>                return (internalArray.length / ((float) numElements)) &gt; contractionCriteria;<a name="line.778"></a>
<FONT color="green">779</FONT>            } else {<a name="line.779"></a>
<FONT color="green">780</FONT>                return (internalArray.length - numElements) &gt; contractionCriteria;<a name="line.780"></a>
<FONT color="green">781</FONT>            }<a name="line.781"></a>
<FONT color="green">782</FONT>        }<a name="line.782"></a>
<FONT color="green">783</FONT>    <a name="line.783"></a>
<FONT color="green">784</FONT>        /**<a name="line.784"></a>
<FONT color="green">785</FONT>         * Returns the starting index of the internal array.  The starting index is<a name="line.785"></a>
<FONT color="green">786</FONT>         * the position of the first addressable element in the internal storage<a name="line.786"></a>
<FONT color="green">787</FONT>         * array.  The addressable elements in the array are &lt;code&gt;<a name="line.787"></a>
<FONT color="green">788</FONT>         * internalArray[startIndex],...,internalArray[startIndex + numElements -1]<a name="line.788"></a>
<FONT color="green">789</FONT>         * &lt;/code&gt;<a name="line.789"></a>
<FONT color="green">790</FONT>         *<a name="line.790"></a>
<FONT color="green">791</FONT>         * @return starting index<a name="line.791"></a>
<FONT color="green">792</FONT>         */<a name="line.792"></a>
<FONT color="green">793</FONT>        public synchronized int start() {<a name="line.793"></a>
<FONT color="green">794</FONT>            return startIndex;<a name="line.794"></a>
<FONT color="green">795</FONT>        }<a name="line.795"></a>
<FONT color="green">796</FONT>        <a name="line.796"></a>
<FONT color="green">797</FONT>        /**<a name="line.797"></a>
<FONT color="green">798</FONT>         * &lt;p&gt;Copies source to dest, copying the underlying data, so dest is<a name="line.798"></a>
<FONT color="green">799</FONT>         * a new, independent copy of source.  Does not contract before<a name="line.799"></a>
<FONT color="green">800</FONT>         * the copy.&lt;/p&gt;<a name="line.800"></a>
<FONT color="green">801</FONT>         * <a name="line.801"></a>
<FONT color="green">802</FONT>         * &lt;p&gt;Obtains synchronization locks on both source and dest<a name="line.802"></a>
<FONT color="green">803</FONT>         * (in that order) before performing the copy.&lt;/p&gt;<a name="line.803"></a>
<FONT color="green">804</FONT>         * <a name="line.804"></a>
<FONT color="green">805</FONT>         * &lt;p&gt;Neither source nor dest may be null; otherwise a NullPointerException<a name="line.805"></a>
<FONT color="green">806</FONT>         * is thrown&lt;/p&gt;<a name="line.806"></a>
<FONT color="green">807</FONT>         * <a name="line.807"></a>
<FONT color="green">808</FONT>         * @param source ResizableDoubleArray to copy<a name="line.808"></a>
<FONT color="green">809</FONT>         * @param dest ResizableArray to replace with a copy of the source array<a name="line.809"></a>
<FONT color="green">810</FONT>         * @since 2.0<a name="line.810"></a>
<FONT color="green">811</FONT>         * <a name="line.811"></a>
<FONT color="green">812</FONT>         */<a name="line.812"></a>
<FONT color="green">813</FONT>        public static void copy(ResizableDoubleArray source, ResizableDoubleArray dest) {<a name="line.813"></a>
<FONT color="green">814</FONT>           synchronized(source) {<a name="line.814"></a>
<FONT color="green">815</FONT>               synchronized(dest) {<a name="line.815"></a>
<FONT color="green">816</FONT>                   dest.initialCapacity = source.initialCapacity;<a name="line.816"></a>
<FONT color="green">817</FONT>                   dest.contractionCriteria = source.contractionCriteria;<a name="line.817"></a>
<FONT color="green">818</FONT>                   dest.expansionFactor = source.expansionFactor;<a name="line.818"></a>
<FONT color="green">819</FONT>                   dest.expansionMode = source.expansionMode;<a name="line.819"></a>
<FONT color="green">820</FONT>                   dest.internalArray = new double[source.internalArray.length];<a name="line.820"></a>
<FONT color="green">821</FONT>                   System.arraycopy(source.internalArray, 0, dest.internalArray,<a name="line.821"></a>
<FONT color="green">822</FONT>                           0, dest.internalArray.length);<a name="line.822"></a>
<FONT color="green">823</FONT>                   dest.numElements = source.numElements;<a name="line.823"></a>
<FONT color="green">824</FONT>                   dest.startIndex = source.startIndex;<a name="line.824"></a>
<FONT color="green">825</FONT>               }<a name="line.825"></a>
<FONT color="green">826</FONT>           }<a name="line.826"></a>
<FONT color="green">827</FONT>        }<a name="line.827"></a>
<FONT color="green">828</FONT>        <a name="line.828"></a>
<FONT color="green">829</FONT>        /**<a name="line.829"></a>
<FONT color="green">830</FONT>         * Returns a copy of the ResizableDoubleArray.  Does not contract before<a name="line.830"></a>
<FONT color="green">831</FONT>         * the copy, so the returned object is an exact copy of this.<a name="line.831"></a>
<FONT color="green">832</FONT>         * <a name="line.832"></a>
<FONT color="green">833</FONT>         * @return a new ResizableDoubleArray with the same data and configuration<a name="line.833"></a>
<FONT color="green">834</FONT>         * properties as this<a name="line.834"></a>
<FONT color="green">835</FONT>         * @since 2.0<a name="line.835"></a>
<FONT color="green">836</FONT>         */<a name="line.836"></a>
<FONT color="green">837</FONT>        public synchronized ResizableDoubleArray copy() {<a name="line.837"></a>
<FONT color="green">838</FONT>            ResizableDoubleArray result = new ResizableDoubleArray();<a name="line.838"></a>
<FONT color="green">839</FONT>            copy(this, result);<a name="line.839"></a>
<FONT color="green">840</FONT>            return result;<a name="line.840"></a>
<FONT color="green">841</FONT>        }<a name="line.841"></a>
<FONT color="green">842</FONT>        <a name="line.842"></a>
<FONT color="green">843</FONT>        /**<a name="line.843"></a>
<FONT color="green">844</FONT>         * Returns true iff object is a ResizableDoubleArray with the same properties<a name="line.844"></a>
<FONT color="green">845</FONT>         * as this and an identical internal storage array.<a name="line.845"></a>
<FONT color="green">846</FONT>         * <a name="line.846"></a>
<FONT color="green">847</FONT>         * @param object object to be compared for equality with this<a name="line.847"></a>
<FONT color="green">848</FONT>         * @return true iff object is a ResizableDoubleArray with the same data and<a name="line.848"></a>
<FONT color="green">849</FONT>         * properties as this<a name="line.849"></a>
<FONT color="green">850</FONT>         * @since 2.0<a name="line.850"></a>
<FONT color="green">851</FONT>         */<a name="line.851"></a>
<FONT color="green">852</FONT>        @Override<a name="line.852"></a>
<FONT color="green">853</FONT>        public boolean equals(Object object) {<a name="line.853"></a>
<FONT color="green">854</FONT>            if (object == this ) {<a name="line.854"></a>
<FONT color="green">855</FONT>                return true;<a name="line.855"></a>
<FONT color="green">856</FONT>            }<a name="line.856"></a>
<FONT color="green">857</FONT>           if (object instanceof ResizableDoubleArray == false) {<a name="line.857"></a>
<FONT color="green">858</FONT>                return false;<a name="line.858"></a>
<FONT color="green">859</FONT>            }<a name="line.859"></a>
<FONT color="green">860</FONT>           synchronized(this) {<a name="line.860"></a>
<FONT color="green">861</FONT>               synchronized(object) {<a name="line.861"></a>
<FONT color="green">862</FONT>                   boolean result = true;<a name="line.862"></a>
<FONT color="green">863</FONT>                   ResizableDoubleArray other = (ResizableDoubleArray) object;<a name="line.863"></a>
<FONT color="green">864</FONT>                   result = result &amp;&amp; (other.initialCapacity == initialCapacity);<a name="line.864"></a>
<FONT color="green">865</FONT>                   result = result &amp;&amp; (other.contractionCriteria == contractionCriteria);<a name="line.865"></a>
<FONT color="green">866</FONT>                   result = result &amp;&amp; (other.expansionFactor == expansionFactor);<a name="line.866"></a>
<FONT color="green">867</FONT>                   result = result &amp;&amp; (other.expansionMode == expansionMode);<a name="line.867"></a>
<FONT color="green">868</FONT>                   result = result &amp;&amp; (other.numElements == numElements);<a name="line.868"></a>
<FONT color="green">869</FONT>                   result = result &amp;&amp; (other.startIndex == startIndex);<a name="line.869"></a>
<FONT color="green">870</FONT>                   if (!result) { <a name="line.870"></a>
<FONT color="green">871</FONT>                       return false;<a name="line.871"></a>
<FONT color="green">872</FONT>                   } else {<a name="line.872"></a>
<FONT color="green">873</FONT>                       return Arrays.equals(internalArray, other.internalArray);<a name="line.873"></a>
<FONT color="green">874</FONT>                   }<a name="line.874"></a>
<FONT color="green">875</FONT>               }<a name="line.875"></a>
<FONT color="green">876</FONT>           }<a name="line.876"></a>
<FONT color="green">877</FONT>        }<a name="line.877"></a>
<FONT color="green">878</FONT>        <a name="line.878"></a>
<FONT color="green">879</FONT>        /**<a name="line.879"></a>
<FONT color="green">880</FONT>         * Returns a hash code consistent with equals.<a name="line.880"></a>
<FONT color="green">881</FONT>         * <a name="line.881"></a>
<FONT color="green">882</FONT>         * @return hash code representing this ResizableDoubleArray<a name="line.882"></a>
<FONT color="green">883</FONT>         * @since 2.0<a name="line.883"></a>
<FONT color="green">884</FONT>         */<a name="line.884"></a>
<FONT color="green">885</FONT>        @Override<a name="line.885"></a>
<FONT color="green">886</FONT>        public synchronized int hashCode() {<a name="line.886"></a>
<FONT color="green">887</FONT>            int[] hashData = new int[7];<a name="line.887"></a>
<FONT color="green">888</FONT>            hashData[0] = new Float(expansionFactor).hashCode();<a name="line.888"></a>
<FONT color="green">889</FONT>            hashData[1] = new Float(contractionCriteria).hashCode();<a name="line.889"></a>
<FONT color="green">890</FONT>            hashData[2] = expansionMode;<a name="line.890"></a>
<FONT color="green">891</FONT>                hashData[3] = Arrays.hashCode(internalArray);<a name="line.891"></a>
<FONT color="green">892</FONT>                hashData[4] = initialCapacity;<a name="line.892"></a>
<FONT color="green">893</FONT>                hashData[5] = numElements;<a name="line.893"></a>
<FONT color="green">894</FONT>                hashData[6] = startIndex;<a name="line.894"></a>
<FONT color="green">895</FONT>            return Arrays.hashCode(hashData);<a name="line.895"></a>
<FONT color="green">896</FONT>        }<a name="line.896"></a>
<FONT color="green">897</FONT>             <a name="line.897"></a>
<FONT color="green">898</FONT>    }<a name="line.898"></a>




























































</PRE>
</BODY>
</HTML>
